David 'Digit' Turner
e31bfae2ba
bionic: Do not use <sys/atomics.h> for platform code.
We're going to modify the __atomic_xxx implementation to provide full memory barriers, to avoid problems for NDK machine code that link to these functions. First step is to remove their usage from our platform code. We now use inlined versions of the same functions for a slight performance boost. + remove obsolete atomics_x86.c (was never compiled) NOTE: This improvement was benchmarked on various devices. Comparing a pthread mutex lock + atomic increment + unlock we get: - ARMv7 emulator, running on a 2.4 GHz Xeon: before: 396 ns after: 288 ns - x86 emulator in KVM mode on same machine: before: 27 ns after: 27 ns - Google Nexus S, in ARMv7 mode (single-core): before: 82 ns after: 76 ns - Motorola Xoom, in ARMv7 mode (multi-core): before: 121 ns after: 120 ns The code has also been rebuilt in ARMv5TE mode for correctness. Change-Id: Ic1dc72b173d59b2e7af901dd70d6a72fb2f64b17
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